1. Jet streams occur in the Northern Hemisphere only.
2. Only some cyclones develop an eye.
3. The temperature inside the eye of a cyclone is nearly 10°C less than that of the surroundings.
Which of the statements given above is/are correct?
Explanation
The Jet Stream is a geostrophic wind that generally blows from west to east across the upper layers of the troposphere at an altitude of 20,000 to 50,000 feet. Air masses with different temperatures collide to form jet streams. Thus, the location of the Jet Stream’s formation is normally characterized by surface temperatures.
Statement 1 is incorrect: Jet streams exist in both the Northern and Southern Hemispheres. They typically form near the boundaries of major air masses and are driven by temperature differences and the Earth’s rotation. The Polar Jet Stream and Subtropical Jet Stream are present in both hemispheres.
Statement 2 is correct: Not all cyclones form an eye. The eye is a distinct feature of well-developed, intense tropical cyclones. In contrast, temperate cyclones do not have an eye because there is no central area where winds and rainfall are calm or inactive.
Statement 3 is incorrect: The eye of a tropical cyclone is the calm center with the lowest surface pressure and the warmest air above it. At about 12 km high, the air in the eye can be 10°C or more warmer than the surrounding air, while at the surface, it’s only 0-2°C warmer.
For S1, The use of the word "only" makes this statement absolute. Since the Earth is symmetrically divided into the Northern and Southern Hemispheres, and both have similar atmospheric circulation patterns, jet streams should exist in both hemispheres. Hence S1 likely false. For S3, Beware of antonym as they are easy to manipulate, is it "less" or "more"?